const fs = require('fs');
let readstream = fs.createReadStream('input.txt')
let writestream = fs.createWriteStream('output.txt');

// 管道读写操作
// 读取 input.txt 文件内容，并将内容写入到 output.txt 文件中
readstream.pipe(writestream);
console.log('程序执行完毕！');
